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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] [ASM INTEL SYNTAX] clang generates incorrect assembler code when x86-asm-syntax=intel"
href="https://bugs.llvm.org/show_bug.cgi?id=34617">34617</a>
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<th>Summary</th>
<td>[X86] [ASM INTEL SYNTAX] clang generates incorrect assembler code when x86-asm-syntax=intel
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>konstantin.belochapka@sony.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider the following source code:
-----------------------------------------------------------------
char X[ 4 ];
extern char testCall084(long n, char* y);
volatile char* px;
char test084(long x0) {
char rc = testCall084(x0, X);
px = X;
return rc;
}
Running:
$clang -S -O1 -mllvm --x86-asm-syntax=intel source.cpp
Produces the following assembler source:
--------------------------------------------------------------
_Z7test084l:
push rax
mov esi, X
call _Z11testCall084lPc
mov qword ptr [rip + px], X
pop rcx
ret
GNU assembler interprets:
1 mov esi, X
2 mov qword ptr [rip + px], X
as:
1 mov esi, [X]
2 mov qword ptr [rip + px], [X]
which produces incorrect binary code for first instruction
and error message:
"too many memory references for `mov'" for second instruction.</pre>
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